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Simplifying 12x + 14 + 9x + -2 = 180 Reorder the terms: 14 + -2 + 12x + 9x = 180 Combine like terms: 14 + -2 = 12 12 + 12x + 9x = 180 Combine like terms: 12x + 9x = 21x 12 + 21x = 180 Solving 12 + 21x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 21x = 180 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 180 + -12 21x = 180 + -12 Combine like terms: 180 + -12 = 168 21x = 168 Divide each side by '21'. x = 8 Simplifying x = 8
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